PROT 407: Transmission Line Protection

PROT 407 provides an in-depth study of the principles and schemes for protecting high-voltage power transmission lines. The course provides advanced guidelines for relay application and settings for transmission lines, including series-compensated lines, and reviews time-domain ultra-high-speed line protection principles. Additional topics include the application and settings of power swing blocking and out-of-step tripping functions, an overview of power system faults, and instrument transformers.

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Audience

This course is intended for engineers who need a comprehensive understanding of the design concepts and methods used in protecting high-voltage power transmission lines.

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Agenda

Day 1

• Power System Faults
• Class Exercise: Autotransformer High-Voltage Side Single-Phase-to-Ground Fault Calculation
• Class Exercise: Autotransformer Tertiary Winding and Neutral Fault Current Calculation
• Power Line Overview

Day 2

• Relaying Fundamentals
• Class Exercise: Relaying Fundamentals
• Instrument Transformers
• Class Exercise: Current Transformers
• Line Directional Overcurrent Protection

Day 3

• Class Exercise: Line Directional Overcurrent Protection
• Line Distance Protection
• Class Exercise: Line Distance Protection Settings Calculation

Day 4

• Line Directional Comparison Protection
• Line Current-Based Protection
• Time-Domain Line Protection

Day 5

• Series-Compensated Line Protection
• Power Swing Blocking and Out-of-Step Tripping
• Class Exercise: Power Swing Blocking Element Setting Calculation

Note: This course teaches fundamental knowledge but does not provide hands-on experience with SEL relays.

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Learning Outcomes

At the conclusion of this course, students can:

• Describe transmission line protection problems and identify solutions using digital relays.
• Select the appropriate transmission line protection schemes for various applications.
• Calculate settings for transmission line protection schemes, including directional overcurrent, distance, and pilot protection schemes.
• Specify current transformers for protective relay applications.
• Describe the various pilot protection schemes for transmission lines.
• Discuss the advantages of line current differential protection.
• Describe time-domain ultra-high-speed transmission line protection.
• Identify the challenges and solutions to series-compensated transmission line protection.
• Identify and apply power swing blocking and out-of-step tripping.

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Student Background and Knowledge

A degree in electrical engineering or equivalent experience is recommended. In addition, we recommend that you complete PROT 401: Protecting Power Systems for Engineers OR have the following:

• Familiarity with transmission line characteristics.
• A basic knowledge of protective relay design, symmetrical components, fault analysis, and power system protection.
• A working knowledge of trigonometry, basic calculus, complex numbers, and phasor concepts.

Click here to view our recommended reading on these topics:

• Electric circuit analysis
• Power systems that cover symmetrical components, fault analysis, power lines, and electrical transients in power systems

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